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attiny24a_memory-led-game/firmware.asm

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;
; Project name: memory-led-game
; Description: Simple memory game using leds
; Source code: https://github.com/sergeyyarkov/attiny24a_memory-led-game
; Device: ATtiny24A
; Package: 14-pin-PDIP_SOIC
; Assembler: gavrasm v5.0
; Clock frequency: 8MHz with CKDIV8
; Fuses: lfuse: 0x42, hfuse: 0xDF, efuse: 0xFF, lock:0xFF
;
; Written by Sergey Yarkov 27.09.2021
.device ATtiny24A ; Setup device name
.list ; Enable listing
;
; LEDS constants
.equ LED_DIR = DDRA
.equ LED_PORT = PORTA
.equ LED_PIN = PINA
.equ LED_PIN_0 = PINA0
.equ LED_PIN_1 = PINA1
.equ LED_PIN_2 = PINA2
.equ LED_PIN_3 = PINA3
;
; Buttons constants
.equ SW_DIR = DDRA
.equ SW_PORT = PORTA
.equ SW_PIN = PINA
.equ SW_PIN_4 = PINA4
.equ SW_PIN_5 = PINA5
.equ SW_PIN_6 = PINA6
.equ SW_PIN_7 = PINA7
;
; Buzzer constants
.equ BUZZ_DIR = DDRB
.equ BUZZ_PORT = PORTB
.equ BUZZ_PIN = PINB2
;
; States constants
.equ INIT_STATE = 0x01
.equ SHOWING_STATE = 0x02
.equ POLLING_STATE = 0x03
.equ COMPLETION_STATE = 0x04
;
; SW Flags states constants
.equ SW_FLAG_1 = 0xe0
.equ SW_FLAG_2 = 0xd0
.equ SW_FLAG_3 = 0xb0
.equ SW_FLAG_4 = 0x70
.macro init_stack_p ; Setup stack pointer
ldi @0, low(@1)
out SPL, @0
.endm
;
; @0 - I/O Register
; @1 - Data to write
.macro outi ; Out to i/o reg
push r16
ldi r16, @1
out @0, r16
pop r16
.endm
;
; @0 - SRAM Address
; @1 - Data to write
.macro stsi ; Write to SRAM
push r16
ldi r16, @1
sts @0, r16
pop r16
.endm
;
; @0 - New state
.macro set_state
push r16
lds r16, CURRENT_STATE_ADDRESS
sts PREVIOUS_STATE_ADDRESS, r16
stsi CURRENT_STATE_ADDRESS, @0
pop r16
.endm
.dseg ; Data segment
.org SRAM_START
;
; MCU Global states
CURRENT_STATE_ADDRESS: .byte 0x01
PREVIOUS_STATE_ADDRESS: .byte 0x01
;
; Button flags
SW_FLAGS_ADDRESS: .byte 0x01
.cseg ; Code segment
.org 0x00 ; Start program at 0x00
;
; Setup vectors
rjmp start ; Program start at RESET vector
reti ; External Interrupt Request 0 / inactive
rjmp PCINT0_vect ; Pin Change Interrupt Request 0 / active
reti ; Pin Change Interrupt Request 1 / inactive
reti ; Watchdog Time-out / inactive
reti ; Timer/Counter1 Capture Event / inactive
reti ; Timer/Counter1 Compare Match A / inactive
reti ; Timer/Counter1 Compare Match B / inactive
reti ; Timer/Counter1 Overflow / inactive
reti ; Timer/Counter0 Compare Match A / inactive
reti ; Timer/Counter0 Compare Match B / inactive
reti ; Timer/Counter0 Overflow / inactive
reti ; Analog Comparator / inactive
reti ; ADC Conversion Complete / inactive
reti ; EEPROM Ready / inactive
reti ; USI START / inactive
reti ; USI Overflow / inactive
;
; Interrupt service routines
PCINT0_vect:
push r17
push r18
; // TODO update flag only in POLLING state of MCU
in r18, SREG
in r17, PINA ; Load current pins status of PINA
andi r17, 0xf0 ; Get pins status of only buttons
rcall delay_50ms
sts SW_FLAGS_ADDRESS, r17 ; Update flag status in SRAM
out SREG, r18
pop r18
pop r17
reti
;
; Program start at reset
start:
init_stack_p r16, RAMEND ; Init stack pointer of MCU
set_state INIT_STATE ; Turn MCU state to initialization
loop: ; Program loop
lds r16, CURRENT_STATE_ADDRESS
init: ; Init state
cpi r16, INIT_STATE
brne showing
rcall MCU_Init
; rcall delay_1s
set_state SHOWING_STATE
showing: ; Showing state
cpi r16, SHOWING_STATE
brne polling
lds r18, SW_FLAGS_ADDRESS
led_1:
cpi r18, SW_FLAG_1
brne led_off_1
led_on_1:
sbi LED_PORT, 0
rjmp led_2
led_off_1:
cbi LED_PORT, 0
led_2:
cpi r18, SW_FLAG_2
brne led_off_2
led_on_2:
sbi LED_PORT, 1
rjmp led_3
led_off_2:
cbi LED_PORT, 1
led_3:
cpi r18, SW_FLAG_3
brne led_off_3
led_on_3:
sbi LED_PORT, 2
rjmp led_4
led_off_3:
cbi LED_PORT, 2
led_4:
cpi r18, SW_FLAG_4
brne led_off_4
led_on_4:
sbi LED_PORT, 3
rjmp polling
led_off_4:
cbi LED_PORT, 3
polling: ; Polling state
cpi r16, POLLING_STATE
brne completion
completion:
cpi r16, COMPLETION_STATE ; Completion state
brne default
default: ; Do nothing
rjmp loop
effect_1: ; Shift bits of an leds in port every 50ms
push r17
push r18
push r19
push r20
in r20, LED_PORT
outi LED_PORT, 0xf1
rcall delay_50ms
ldi r17, 0x01
ldi r19, 3
_eff_1_shift_l: ; Shift bits to left loop
ldi r18, 0xf0
lsl r17
add r18, r17
out LED_PORT, r18
rcall delay_50ms
dec r19
brne _eff_1_shift_l
outi LED_PORT, 0xf8
rcall delay_50ms
ldi r17, 0x08
ldi r19, 3
_eff_1_shift_r: ; Shift bits to right loop
ldi r18, 0xf0
lsr r17
add r18, r17
out LED_PORT, r18
rcall delay_50ms
dec r19
brne _eff_1_shift_r
;
; Out saved PORT values
out LED_PORT, r20
pop r20
pop r19
pop r18
pop r17
ret
MCU_Init:
rcall init_ports
rcall init_interrupts
rcall delay_before_start ; Init MCU and delay before start main program
ret
delay_before_start:
ldi r17, 6
_init_loop_loading:
rcall effect_1
dec r17
brne _init_loop_loading
rcall delay_1s
ret
init_interrupts:
;
; Enable Port Change Interrupt
ldi r16, (1<<PCIE0)
out GIMSK, r16
;
; Set Pin Change Mask Register
ldi r16, (1<<PCINT4) | (1<<PCINT5)| (1<<PCINT6) | (1<<PCINT7)
out PCMSK0, r16
clr r16
sei ; Enable Global Interrupts
ret
init_ports: ; Init MCU ports
; Setup PORTA
ldi r16, 0x0f
out DDRA, r16 ; Set directions of leds and buttons
swap r16
out PORTA, r16 ; Set low signal on leds and pull-up on buttons
; Setup PORTB
sbi DDRB, BUZZ_PIN ; Set direction of buzzer pin to output
cbi PORTB, BUZZ_PIN ; Set low signal on buzzer
ret
delay_50ms: ; For 1MHz frequency
push r18
push r19
ldi r18, 65
ldi r19, 239
_loop_d_50ms:
dec r19
brne _loop_d_50ms
dec r18
brne _loop_d_50ms
nop
pop r19
pop r18
ret
delay_1s: ; For 1MHz frequency
.equ outer_count = 100
.equ inner_count = 2499
push r24
push r25
ldi r18, outer_count
_reset:
ldi r24, low(inner_count)
ldi r25, high(inner_count)
_loop:
sbiw r24, 1
brne _loop
dec r18
brne _reset
ldi r18, outer_count
pop r25
pop r24
ret
info: .db "Memory led game. Written by Sergey Yarkov 27.09.2021"
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